Hänsel-Hohenhausen's writings on philosophy and church history have been distributed in over 120,000 copies (as of 2009). They have been recognised by well-known experts, such as:

Professor Dr. Robert Spaemann about „I think, therefore I believe“: „The subjects discussed are considered with great competence. The context shown between the subjects is indeed as creative as it is convincing.“

Professor Dr. Dr. h.c. mult. Jürgen Moltmann D.D. mult. about „The Countenance in the World“:
„I am deeply impressed. Your encourage reflection and further consideration of your ideas, and you do this on so many levels that I do not know where to begin to express my gratitude.“

Professor Dr. Drs. h.c. Eberhard Jüngel about „The Countenance in the World“: „Not since Levinas has there been such a powerful appraisal of the countenance as a synonym for the person.“

Professor Dr. Kurt Hübner about „I think, therefore I believe“ and „Amalie Fürstin von Gallitzin, Bedeutung und Wirkung“): „This is completely unchartered territory in the philosophy of science.“

Professor Dr. Volker Kapp about „Schönheit aus Wahrheit, Vom Wunder des Antlitzes im Bildnis“: „Vasari’s view on the creative individual and Giovio’s description of lives as templates of shining or poor examples are the mainstreams in biographical writing until today. Dr Markus von Hänsel-Hohenhausen shows us a third methodology which is free of Giovio’s moralistic idea – he does not create models as examples for ourselves. His point of view is the grandeur in highly individual circumstances, the grandeur of Man which shines forth in his auratic countenance and in his true portrait. Even the successful individuals of the described are not recommended as model for how to start a career. They are expressing what Man can be and what the human being is called upon to be. That is from the view of a historian of literature completely new and innovative. Hänsel-Hohenhausen’s understanding of the biography extends our old tradition of galleries of portrayals. His concentration on the individual countenance appears to be another key position to understand the wealth of human variety."

Joachim Kardinal Meisner, Erzbischof of Köln about „The Countenance in the World“: „The considerations and conclusions have intellectually and linguistically a high level. The works of Markus von Hänsel-Hohenhausen are extending the philosophia perennis, that has characterized western culture for so long, and yet now appears to be in real danger of becoming extinct.“